## The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago Vitiated These Books, are Corrected and Some of Euclid's Demonstrations are Restored. Also, to this Second Edition is Added the Book of Euclid's Data. In Like Manner Corrected. viz. the first six books, together with the eleventh and twelfth |

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Page 7

11 AxiCA is equal to CB , wherefore CA , AB ,

11 AxiCA is equal to CB , wherefore CA , AB ,

**BC**are equal to one another , and the triangle ABC is therefore equilateral , and it is described upon the**given**straight line AB , Which was required to be done . PROP . II . PROB . Page 13

therefore

therefore

**BC**coinciding with EF , BA and AC shall coincide with ED Book I. and DF . for if the base**BC**coincides with the base EF , but the sides m ... O bisect a**given**rectilineal angle , that is , to divide it into two equal angles . Page 14

... CD are equal to

... CD are equal to

**BC**, CD , each to each ; and the angle ACD is equal to the angle BCD ; therefore the base AD is equal to the base ... O draw a straight line at right angles to a**given**straight line , from a**given**point in the same . Page 28

Let A be the

Let A be the

**given**point , and**BC**the**given**straight line ; it is required to draw a straight line thro ' E A F the point A , parallel to the ... In**BC**take any point D , and join AD ; and at the point A in the straight B D с a . 23. Page 29

drawn thro ' the

drawn thro ' the

**given**point A parallel to the**given**straight line**BC**. Book I. Which was to be done . E b . 19.1 . PRO P. XXXII . THEOR . IF F a fide of any triangle be produced , the exterior angle is equal to the two interior and ...### What people are saying - Write a review

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### Common terms and phrases

added alſo altitude angle ABC angle BAC baſe BC is given becauſe Book caſe circle circle ABCD circumference common cone contained cylinder Definition demonſtrated deſcribed diameter divided double draw drawn equal equal angles equiangular equimultiples exceſs fame fides firſt folid fore four fourth given angle given in poſition given in ſpecies given magnitude given ratio given ſtraight line greater Greek half join leſs likewiſe magnitude manner meet muſt oppoſite parallel parallelogram perpendicular plane priſm produced PROP proportionals Propoſition pyramid reaſon rectangle remaining right angles ſame ſecond ſegment ſhall ſhewn ſides ſimilar ſolid ſquare ſquare of BC taken THEOR theſe third thro triangle ABC wherefore whole

### Popular passages

Page 5 - Let it be granted that a straight line may be drawn from any one point to any other point.

Page 163 - If two triangles have one angle of the one equal to one angle of the other and the sides about these equal angles proportional, the triangles are similar.

Page 48 - If a straight line be divided into any two parts, the squares of the whole line, and of one of the parts, are equal to twice the rectangle contained by the whole and that part, together with the square of the other part. Let the straight line AB be divided into any two parts in the point C; the squares of AB, BC are equal to twice the rectangle AB, BC, together with the square of AC.

Page 73 - The straight line drawn at right angles to the diameter of a circle, from the extremity of it, falls without the circle; and no straight line can be drawn from the extremity between that straight line and the circumference, so as not to cut the circle...

Page 105 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz. either the sides adjacent to the equal...

Page 3 - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another.

Page 167 - Similar triangles are to one another in the duplicate ratio of their homologous sides.

Page 54 - AB be the given straight line ; it is required to divide it into two parts, so that the rectangle contained by the whole, and one of the parts, shall be equal to the square of the other part.

Page 47 - If a straight line be divided into two equal parts, and also into two unequal parts; the rectangle contained by the unequal parts, together with the square of the line between the points of section, is equal to the square of half the line.

Page 37 - To describe a parallelogram that shall be equal to a given triangle, and have one of its angles equal to a given rectilineal angle.